Sieno Switchgears Co., Ltd. – Your Trusted Partner in Low Voltage Electrical Solutions At Sieno Switchgears Co., Ltd., we specialize in manufacturing high-quality low voltage electrical products. Our diverse portfolio includes waterproof power supply switches, AC adapters, magnetic AC contactors, RCCB and MCCB circuit breakers, distribution boxes, proximity sensor switches, surge arresters (SPD), and other essential elec...